Cover does not fit for the Samsung Galaxy Tab S

I've brought my case for my Samsung Galaxy Tab S. The shipment was quite fast (about 1 - 1 1/2 weeks).
Since the shell is not just expensive or from a known brand, I have nothing but cheap China Quallität expected. Nevertheless, I thought that they would at least match. In addition, as described, a sheet and a pen supplied. The film had already blown between the protective films, which has, unfortunately, so transferred on the tray. The pen I can not use.
For me it was primarily concerned with the shell. The tablet is very difficult to squeeze into the shell. Sometimes I was afraid of the outer frame would break off from the tablet, because I had to work with a lot of pressure. After I had finally managed, everything was good at first. The buttons that are completely covered by the shell, were harder to press. A true problem occurred then but on during charging. The opening to the USB port was cut much too small, so I could plug in the cable barely, which in turn caused that the tray is not loaded. Every time violently from the casing to zuppeln the tray to load it and then squeeze in there again, I think is not an appropriate solution. That I had really differently.
2 stars for sweet designs, but unfortunately no stars for functionality. Should someone come to a solution, but wrote me a message.